2023 Ostra Group Open – Singles

Evan Furness was the defending champion^[1] but retired from his first round match against Gaël Monfils.

Singles
2023 Ostra Group Open
Champion	Zdeněk Kolář
Runner-up	Máté Valkusz
Score	6–3, 6–2

Main article: 2023 Ostra Group Open

Zdeněk Kolář won the title after defeating Máté Valkusz 6–3, 6–2 in the final.^[2]

Seeds

1. Ryan Peniston (first round)
2. Ivan Gakhov (second round)
3. Vít Kopřiva (second round)
4. Geoffrey Blancaneaux (second round)
5. Alejandro Tabilo (withdrew)
6. Riccardo Bonadio (semifinals)
7. Oleksii Krutykh (second round)
8. Damir Džumhur (quarterfinals)
9. Dalibor Svrčina (second round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• ITF = ITF entry
• PR = Protected ranking
• SR = Special ranking
• SE = Special exempt
• JE = Junior exempt
• JR = Junior Accelerator Programme entrant
• CO = College Accelerator Programme entrant
• NG = Next Gen Accelerator Program entrant
• w/o = Walkover
• r = Retired
• d = Defaulted

Finals

	Semifinals							Final
	Alt	Shintaro Mochizuki	3	6	2
		Zdeněk Kolář	6	2	6
									Zdeněk Kolář	6	6
									Máté Valkusz	3	2
		Máté Valkusz	6	6
	6	Riccardo Bonadio	0	4

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	R Peniston	2	3
	WC	J Menšík	6	6				WC	J Menšík	6	2	64
	Q	G Andreozzi	6	4	1			Alt	S Mochizuki	1	6	77
	Alt	S Mochizuki	2	6	6										Alt	S Mochizuki	5	6	6
	WC	G Monfils	6	2											8	D Džumhur	7	2	3
		E Furness	3	0r				WC	G Monfils	3	4
	Q	H Squire	3	0				8	D Džumhur	6	6
	8	D Džumhur	6	6																		Alt	S Mochizuki	3	6	2
	3	V Kopřiva	7	4	6																		Z Kolář	6	2	6
		D Added	5	6	3			3	V Kopřiva	2	1
		M Zekić	69	2					Z Kolář	6	6
		Z Kolář	711	6												Z Kolář	6	2	6
		G Onclin	4	6	6											G Onclin	2	6	4
	Alt	V Sachko	6	4	2				G Onclin	6	6
	Q	R Molleker	0	6	1			9	D Svrčina	0	3
	9	D Svrčina	6	2	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	7	O Krutykh	6	6
		ND Ionel	1	2				7	O Krutykh	1	4
		R Collignon	4	4					F Ferreira Silva	6	6
		F Ferreira Silva	6	6												F Ferreira Silva	64	1
	Q	P Rikl	3	6	1											M Valkusz	77	6
		M Valkusz	6	4	6				M Valkusz	6	6
		Pol Martín Tiffon	4	3				4	G Blancaneaux	3	4
	4	G Blancaneaux	6	6																			M Valkusz	6	6
	6	R Bonadio	6	6																		6	R Bonadio	0	4
	Q	Àlex Martí Pujolràs	4	3				6	R Bonadio	6	77
	Q	K Sultanov	2	0					H Mayot	1	63
		H Mayot	6	6											6	R Bonadio	65	6	6
	WC	J Veselý	6	67	6										WC	J Veselý	77	3	4
		L Giustino	3	79	2			WC	J Veselý	2	6	6
		L Rosol	4	6	1			2	I Gakhov	6	3	4
	2	I Gakhov	6	3	6